Vol. 66
Latest Volume
All Volumes
PIERL 108 [2023] PIERL 107 [2022] PIERL 106 [2022] PIERL 105 [2022] PIERL 104 [2022] PIERL 103 [2022] PIERL 102 [2022] PIERL 101 [2021] PIERL 100 [2021] PIERL 99 [2021] PIERL 98 [2021] PIERL 97 [2021] PIERL 96 [2021] PIERL 95 [2021] PIERL 94 [2020] PIERL 93 [2020] PIERL 92 [2020] PIERL 91 [2020] PIERL 90 [2020] PIERL 89 [2020] PIERL 88 [2020] PIERL 87 [2019] PIERL 86 [2019] PIERL 85 [2019] PIERL 84 [2019] PIERL 83 [2019] PIERL 82 [2019] PIERL 81 [2019] PIERL 80 [2018] PIERL 79 [2018] PIERL 78 [2018] PIERL 77 [2018] PIERL 76 [2018] PIERL 75 [2018] PIERL 74 [2018] PIERL 73 [2018] PIERL 72 [2018] PIERL 71 [2017] PIERL 70 [2017] PIERL 69 [2017] PIERL 68 [2017] PIERL 67 [2017] PIERL 66 [2017] PIERL 65 [2017] PIERL 64 [2016] PIERL 63 [2016] PIERL 62 [2016] PIERL 61 [2016] PIERL 60 [2016] PIERL 59 [2016] PIERL 58 [2016] PIERL 57 [2015] PIERL 56 [2015] PIERL 55 [2015] PIERL 54 [2015] PIERL 53 [2015] PIERL 52 [2015] PIERL 51 [2015] PIERL 50 [2014] PIERL 49 [2014] PIERL 48 [2014] PIERL 47 [2014] PIERL 46 [2014] PIERL 45 [2014] PIERL 44 [2014] PIERL 43 [2013] PIERL 42 [2013] PIERL 41 [2013] PIERL 40 [2013] PIERL 39 [2013] PIERL 38 [2013] PIERL 37 [2013] PIERL 36 [2013] PIERL 35 [2012] PIERL 34 [2012] PIERL 33 [2012] PIERL 32 [2012] PIERL 31 [2012] PIERL 30 [2012] PIERL 29 [2012] PIERL 28 [2012] PIERL 27 [2011] PIERL 26 [2011] PIERL 25 [2011] PIERL 24 [2011] PIERL 23 [2011] PIERL 22 [2011] PIERL 21 [2011] PIERL 20 [2011] PIERL 19 [2010] PIERL 18 [2010] PIERL 17 [2010] PIERL 16 [2010] PIERL 15 [2010] PIERL 14 [2010] PIERL 13 [2010] PIERL 12 [2009] PIERL 11 [2009] PIERL 10 [2009] PIERL 9 [2009] PIERL 8 [2009] PIERL 7 [2009] PIERL 6 [2009] PIERL 5 [2008] PIERL 4 [2008] PIERL 3 [2008] PIERL 2 [2008] PIERL 1 [2008]
2017-03-31
PIER Letters
Vol. 66, 135-141, 2017
download: 115
RCS Reduction Using a Miniaturized Uni-Planar Electromagnetic Band Gap Structure for Circularly Polarized Microstrip Antenna Array
Lei Zhang Tao Dong
In this paper, a new method for radar cross section (RCS) reduction of circularly polarized (CP) microstrip antenna array with small element spacing is proposed. By employing the element rotation technique and loading EBG structures, the in-band and out-of-band RCSs are reduced simultaneously despite the extreme small space between array elements. The simulated results show that the proposed antenna has an average RCS reduction over 10 dB in the X-band for x-polarized and y-polarized incident waves impinging from normal direction compared to the original CP microstrip antenna array, indicating a fractional bandwidth of 40%. The maximum RCS reduction is over 25 dB. Meanwhile, the radiation performance of the proposed antenna array is kept.
RCS REDUCTION USING A MINIATURIZED UNI-PLANAR ELECTROMAGNETIC BAND GAP STRUCTURE FOR CIRCULARLY POLARIZED MICROSTRIP ANTENNA ARRAY
2017-03-13
PIER Letters
Vol. 66, 127-134, 2017
download: 140
The Testing Scheme for Steel Corrosion in the Reinforced Concrete via Near Field Effect of Meter-Band Wave
Ruiqiang Zhao Hong Zhang Jianting Zhou Leng Liao Runchuan Xia
This paper presents a testing scheme for the steel corrosion in reinforced concrete based on near-field effect of meter wave. The physical mechanism of the near-field method was introduced, and the structure of the measurement device was presented in detail. The electromagnetic field near the steel bar buried in the concrete structure was simulated by the finite difference time domain method. The simulated data show that the mean radiation power decreases monotonously with the increase of the corroded depth of the steel bar, and the corroded area is promising to be imaged directly due to the localization of near field. The results indicate that the near-field technique can act as a new nondestructive testing technique to detect and even image the corrosion area buried in concrete in engineering structure.
THE TESTING SCHEME FOR STEEL CORROSION IN THE REINFORCED CONCRETE VIA NEAR FIELD EFFECT OF METER-BAND WAVE
2017-03-10
PIER Letters
Vol. 66, 121-126, 2017
download: 142
Metamaterial Tri-Band Bandpass Filter Using Meander-Line with Rectangular-Stub
Ashish Kumar Dilip Kumar Choudhary Raghvendra Kumar Chaudhary
In this paper, a new compact tri-band bandpass metamaterial (MTM) filter based on meander line with a rectangular stub is proposed and designed. The pseudo connections between meander line and ports generate interdigital capacitor (IDC) to provide series capacitance. Meander line a rectangular stub is plotted. The proposed filter offers measured first passbands from 1.88-4.0 GHz; second band starts from 5.4-5.9 GHz; third passband ranges from 7.1-7.4 GHz. It has insertion losses of 0.8 dB, 1.5 dB and 2.0 dB at 2.1GHz, 5.7 GHz and 7.3 GHz centre frequencies, respectively. The designed filter will cover S band (2-4 GHz), ISM band (5.725-5.875) and fixed satellite services (7.25-7.3 GHz). Further, the designed filter shows electrical size of 0.14λ0 × 0.13λ0 at zeroth order resonance (ZOR) frequency 2.1 GHz.
METAMATERIAL TRI-BAND BANDPASS FILTER USING MEANDER-LINE WITH RECTANGULAR-STUB
2017-03-10
PIER Letters
Vol. 66, 113-119, 2017
download: 504
E-Plane Five-Port Two-Way Waveguide Power Divider/Combiner with High Amplitude and Phase Consistency
Jinyi Ding Liang Wu Wei Shen Xiao-Wei Sun
This paper proposes a compact E-Plane five-port waveguide power combining and splitting structure in the V-band. The symmetrical five-port structure guarantees excellent amplitude and phase consistency between the input/output ports. Two isolation ports guarantee high isolation between the input/output ports. Meanwhile, the E-plane waveguide structure is more compact than H-plane structure. A two-way power combing structure working from 59 GHz to 64 GHz is designed, fabricated and measured for validating our structure. The measured results show that the phase and amplitude differences between the input ports are smaller than ±1.0 degree and ±0.1 dB, isolation between the input ports higher than 18 dB, the insertion loss and return loss lower than 0.2 dB and better than 17 dB, respectively.
E-PLANE FIVE-PORT TWO-WAY WAVEGUIDE POWER DIVIDER/COMBINER WITH HIGH AMPLITUDE AND PHASE CONSISTENCY
2017-03-07
PIER Letters
Vol. 66, 105-111, 2017
download: 175
A New Single-Layer Reflectarray Using Circular Patch with Semicircular Ring Slots
Yang Liu Hongjian Wang Fei Xue Xingchao Dong
A single-layer reflectarray antenna using circular patch with four semicircular ring slots is proposed in this paper. By changing the diameter of the circular patch, the proposed phasing element can realize phase range about 500 degrees with relatively stable reflection magnitude. Besides, the reflection phase curve with smooth slope is almost linear. Based on the good phase response, a 421-element reflectarray is designed, simulated and fabricated. The measured results show that 1.5-dB gain bandwidth can attain 24% at the center frequency of 15 GHz.
A NEW SINGLE-LAYER REFLECTARRAY USING CIRCULAR PATCH WITH SEMICIRCULAR RING SLOTS
2017-03-03
PIER Letters
Vol. 66, 99-104, 2017
download: 211
An Asymmetrical Bulk CMOS Switch for 2.4 GHz Application
Lang Chen Ye-Bing Gan
A novel asymmetrical single-pole double-throw (SPDT) switch for 2.4 GHz application with high power handle ability is developed. The novel asymmetrical topology is discussed. To increase the power capacity, ac-floating and dc-bias techniques are used. Using these techniques, a switch achieves a measured P1 dB of 20.5 dBm, an insertion loss (IL) of 1.16 dB and isolation loss of 20.8 dB in TX mode; an insertion loss of 1.57 dB and an isolation of 21.6 dB in RX mode. The circuit is fabricated using 3.3-V 0.35-μm DNW NMOS transistors in 0.18-μm bulk CMOS process.
AN ASYMMETRICAL BULK CMOS SWITCH FOR 2.4 GHZ APPLICATION
2017-03-03
PIER Letters
Vol. 66, 93-98, 2017
download: 132
A Compact Wideband Short-Ended Metamaterial Antenna for Wireless Applications
Naveen Mishra Raghvendra Kumar Chaudhary
In this article, design and analysis of a compact wideband short-ended metamaterial antenna based on composite right and left handed transmission line (CRLH-TL) is presented. The proposed antenna is configured with two different shapes (Half ring and simple gap) of series gaps and short ended boundary condition. It offers wide bandwidth by placing two different shapes of series gaps in such a manner, so that the first resonance frequency, i.e., zeroth order resonance (ZOR), second resonance frequency and third resonance frequency occur near each other, and hence combination offers wide bandwidth. Because of the applied boundary conditions, resonant modes can be controlled by series parameters of the proposed antenna structure. Further, coplanar waveguide feeding technique is used which replaces the requirement of via and allows the fabrication of a single layer antenna prototype. The proposed antenna is modeled by using ANSYS HFSS 14.0, and simulated results are verified with experimental ones of the prototype. The simulated fractional bandwidth of the proposed antenna is 52.38% centered at 3.57 GHz. Furthermore, the proposed antenna provides an average broadside gain of 2.30 dBi with average radiation efficiency of 94.95% in the entire working band of antenna.
A COMPACT WIDEBAND SHORT-ENDED METAMATERIAL ANTENNA FOR WIRELESS APPLICATIONS
2017-03-03
PIER Letters
Vol. 66, 85-91, 2017
download: 129
A New Approach to Design of Dual-Band Power Divider Using Admittance Matrix
Yinong Yan Ting Luo Ruifang Su Jing Lu
A new approach to design of a dual-band power divider with only one section transmission line is proposed. Apart from the isolation resistor, admittance matrix is used to synthesize the dual-band divider. According to the required admittance matrixes at two frequencies, a modified configuration with shunting open/short stubs at each port is presented. A new compact dual-band (operating at 1.0 GHz and 4.5 GHz) is developed to validate this proposal. Experimental results demonstrate that the return loss is better than -19.2 dB, insertion loss less than 0.59 dB, and isolation better than 23.61 dB at two operation frequencies. The measured relative bandwidths of 15 dB return loss are 35.9% and 12.4% for the lower and higher bands, respectively.
A NEW APPROACH TO DESIGN OF DUAL-BAND POWER DIVIDER USING ADMITTANCE MATRIX
2017-03-03
PIER Letters
Vol. 66, 79-84, 2017
download: 348
Side Lobe Level Reduction of Any Type of Linear Equally Spaced Array Using the Method of Convolution
Mohammad G. H. Alijani Mohammad Hassan Neshati Mahdi Boozari
In most applications of antenna arrays, side lobe levels (SLLs) are commonly unwanted. Especially, the first side lobe level which determines maximum SLL is the main source of electromagnetic interference (EMI), and hence, it should be lowered. A procedure of finding the optimum side lobe-minimizing weights for an arbitrary linear equally spaced array is derived, which holds for any scan direction, beam width, and type of antenna element used. In this science article, the use of convolution procedure and the time scaling property reduces the side lobe level for any type of linear equally spaced array. Results show that by this procedure, the side lobe level is reduced about two times or even more.
SIDE LOBE LEVEL REDUCTION OF ANY TYPE OF LINEAR EQUALLY SPACED ARRAY USING THE METHOD OF CONVOLUTION
2017-03-02
PIER Letters
Vol. 66, 71-77, 2017
download: 127
Doubly-Periodic Photonic Crystals: Spectral Problems Analysis
Seil S. Sautbekov Yuriy Sirenko Hanna Sliusarenko
The present work is devoted to the clarification of the conditions necessary for step-by-step justification of the possibility of reduction of the homogeneous system of linear algebraic equations for the spectral problems of 2-D photonic crystals by the plane waves method. The issues related to the algorithms and the numerical solutions of these spectral problems are analyzed. The possibility of analytical regularization is investigated, and the ways to improve the convergence of the obtained results are identified.
DOUBLY-PERIODIC PHOTONIC CRYSTALS: SPECTRAL PROBLEMS ANALYSIS
2017-02-24
PIER Letters
Vol. 66, 65-70, 2017
download: 115
Design of a 212 GHz LO Source Used in the Terahertz Radiometer Front-End
Jin Meng De Hai Zhang Chang Hong Jiang Xin Zhao Xiao Peng Li
We introduce a 212 GHz LO source which could be used to drive sub-harmonic mixer in the radiometer front-end. It mainly includes a phase-locked dielectric resonator, a 71 GHz power source and a 212 GHz tripler. Actually, design of 212 GHz tripler is the key technology in the LO chain because the research on W band source is relatively mature. Based on our former research work, there is a great improvement in the design of 212 GHz tripler. At room temperature, the measured efficiency is more than 9% in 208~218 GHz, and the maximum efficiency is about 14.5% at 215.5 GHz when being driven with 21.8 dBm of input power. Besides demand on the main technical specifications, the stability of each module is also extremely important since the front-end is designed to keep working for three months.
DESIGN OF A 212 GHZ LO SOURCE USED IN THE TERAHERTZ RADIOMETER FRONT-END
2017-02-22
PIER Letters
Vol. 66, 59-64, 2017
download: 293
Compact and Wide Stopband E-Plane Waveguide Diplexer Design
Mahdi Alibakhshi Reza Bayderkhani Majid Afsahi
This paper presents the design of a compact E-plane waveguide diplexer with wide stopband characteristics of high rejection level. This is achieved by utilizing a unique E-plane waveguide filter comprising rectangular apertures located along the waveguide's E-plane. The upper and lower sections of the aperture in the septum insert have periodic comb-like ridges. The effect of the septum is (i) to slow the propagating wave that helps to reduce the filter's size, and (ii) widens its stopband property. Dimensions of the periodic ridges of the aperture enable the center frequency of the filter to be controlled without compromising its bandwidth. In addition, the proposed E-plane waveguide filter provides a high isolation between the two diplexer channels, which is necessary to prevent significant cross-talk between the channels. The performance of the proposed design was verified through measurements. There is excellent agreement between the simulated and experimental results.
COMPACT AND WIDE STOPBAND E-PLANE WAVEGUIDE DIPLEXER DESIGN
2017-02-21
PIER Letters
Vol. 66, 53-58, 2017
download: 149
A Frequency Reconfigurable Dual Pole Dual Band Bandpass Filter for X-Band Applications
Amit Bage Sushrut Das
This paper presents a frequency reconfigurable dual-pole, dual-band waveguide bandpass filter. Varactor diode and chip capacitor loaded planar split ring resonators are used on the transverse plane of a waveguide to form the filter. Numerical simulations are carried out using CST microwave studio (version 14). Measured result shows tuning range of the bands are 8.12-8.58 GHz and 10.22-10.68 GHz, respectively. The measured result shows good agreement with the simulated one. The total length of the proposed filter is 10 mm.
A FREQUENCY RECONFIGURABLE DUAL POLE DUAL BAND BANDPASS FILTER FOR X-BAND APPLICATIONS
2017-02-19
PIER Letters
Vol. 66, 45-51, 2017
download: 554
A 70 MHz ~270 MHz Electrical Tunable LC Bandpass Filter Based on Mixed Coupling and Cross-Coupling
Linzhi Liu Qian-Yin Xiang Xiangrong Hu Zongliang Zheng Zhixiong Di Quanyuan Feng
This paper presents an electrical tunable bandpass filter based on tunable LC resonators loaded with semiconductor varactors. Magnetic dominated mixed coupling between the tunable resonators is utilized to compensate the bandwidth of the tunable filter. Cross coupling is created by using magnetic dominated mixed coupling between the resonators and source to load electrical coupling, and two transmission zeros are generated beside the pass band. The tunable mechanism of the proposed filter is studied. The tunable filter is analyzed, designed, fabricated and measured. The measurement shows that the filter can be tuned from 70 MHz to 270 MHz with a fractional bandwidth from 27% to 21%.
A 70 MHZ~270 MHZ ELECTRICAL TUNABLE LC BANDPASS FILTER BASED ON MIXED COUPLING AND CROSS-COUPLING
2017-02-17
PIER Letters
Vol. 66, 39-43, 2017
download: 176
Investigation on Transient Response of Linear Dipole Antennas in the Presence of HEMP Based on Equivalent Circuit
Mahdi Boozari Mohammad G. H. Alijani
Interfering electromagnetic energy could be a very powerful pulse which is generated and incident onto communication system such as linear wire antenna through direct radiation. In this paper, the transient responses of the linear wire antenna such as dipole antenna under the impact of the early-time (E1) high-altitude electromagnetic pulse (HEMP) are investigated using the equivalent circuit due to a primary element used in the modeling of systems for HEMP vulnerability is the linear wire antenna such as dipole antenna. Based on the equivalence concept of HEMP radiation source and linear wire antennas, the response at receiving antenna port is calculated efficiently with an uncomplicated circuit composed of pulse voltage source and lumped elements. Numerical results are presented to confirm the accuracy of the proposed method.
INVESTIGATION ON TRANSIENT RESPONSE OF LINEAR DIPOLE ANTENNAS IN THE PRESENCE OF HEMP BASED ON EQUIVALENT CIRCUIT
2017-02-13
PIER Letters
Vol. 66, 33-38, 2017
download: 115
A Compact UWB BPF with Sharp Roll-off Using CPW to Microstrip Transition Structure
Xinlin Xia Yu Liu Hao Peng Minghuan Ni Haodong Lin Tao Yang
In this letter, a compact ultra-wideband (UWB) bandpass filter based on CPW-to-microstrip transition structure is proposed. Compared with traditional UWB BPF using hybrid structures, the proposed filter has a more sharp selectivity due to a transmission zero located at the lower edge of the passband generated by the combined effect of both CPW-MS-CPW and interdigital coupling line (ICL). Moreover, to further improve its selectivity, the CPW open stubs (CPWOS) are introduced to produce two extra transmission zeros at high frequency. The measured results show that the proposed filter has some good characteristics such as sharp roll-off, compact size (0.54λg × 0.38λg) and a very wide fractional bandwidth of 130%, which is a significant improvement to what has been reported for UWB BPF with similar structures.
A COMPACT UWB BPF WITH SHARP ROLL-OFF USING CPW TO MICROSTRIP TRANSITION STRUCTURE
2017-02-07
PIER Letters
Vol. 66, 25-31, 2017
download: 119
A Wideband Circularly Polarized Slot-Loaded Dipole Antenna with L-Shaped Arms and Parasitic Patches
Wei Hu Le-Hu Wen Zhaoyang Tang Min Zhang Wen-Chao Xiao
In this paper, a broadband circularly polarized (CP) antenna based on slot-loaded dipole with L-shaped arms and parasitic patches is proposed and investigated. Circular polarization is initially obtained at the lower frequency by bending the dipole arms into L-shape. To extend the axial ratio (AR) bandwidth, two pairs of parasitic patches are introduced along the orthogonal sections of the L-shaped arms, so that the modified dipole can yield two additional minimum AR points at the center and higher frequency respectively. Meanwhile, to further extend impedance bandwidth and improve CP performance, circular slots are symmetrically embedded into the tapered-end of each arm design. The measured results of the antenna exhibit a 3-dB AR bandwidth of 61.3% within 10-dB return loss bandwidth of 64.0%. Besides, desirable gains across the wide operation band are also demonstrated.
A WIDEBAND CIRCULARLY POLARIZED SLOT-LOADED DIPOLE ANTENNA WITH L-SHAPED ARMS AND PARASITIC PATCHES
2017-02-06
PIER Letters
Vol. 66, 15-23, 2017
download: 117
Highly Selective Lossy Dual-Band Bandstop Filter Synthesis and Design Based on Predistortion Hybrid Dual-Band Elliptic Refection Function
Socheatra Soeung Peng Wen Wong Sovuthy Cheab
This paper demonstrates a new class of highly selective bandstop filter based on cascading two identical lossy hybrid dual-band bandstop filters of low resonator Q factor. Each filter is synthesized based on multi-stage predistortion reflection mode technique. To demonstrate the approach, 4th order hybrid dual-band elliptic filter network which is a product of elliptic lowpass and highpass network functions has been predistorted and synthesized with low calculated Q factor. The lossy dual-band bandstop filters are fabricated and realized on microstrip planar structure. Both theoretical and experimental results clearly show good agreements with two stopband rejections up to 35 dB for one stage and 50 dB for two stages with passband loss of more than 10 dB.
HIGHLY SELECTIVE LOSSY DUAL-BAND BANDSTOP FILTER SYNTHESIS AND DESIGN BASED ON PREDISTORTION HYBRID DUAL-BAND ELLIPTIC REFECTION FUNCTION
2017-02-01
PIER Letters
Vol. 66, 9-14, 2017
download: 130
Frequency-Tunable Phase Inverter Based on Slot-Line Resonator
Zhenheng Liao Xu-Chun Zhang
This paper describes a frequency-tunable phase inverter based on a slot-line resonator for the first time. The control circuit is designed and located on the defected ground. None of dc block capacitors are needed in the microstrip line. A wide tuning frequency range is accomplished by the use of the slot-line resonator with two varactors and a single control voltage. A 180-degree phase inverter is achieved by means of reversing electric field with two metallic via holes connecting the microstrip and ground plane. The graphic method is used to estimate the operation frequency. For verification, a frequency-tunable phase inverter is fabricated and measured. The measured results show a wide tuning frequency range from 1.1 GHz to 1.75 GHz with better than 20-dB return loss. The measured results are in good agreement with the simulated ones.
FREQUENCY-TUNABLE PHASE INVERTER BASED ON SLOT-LINE RESONATOR
2017-02-03
PIER Letters
Vol. 66, 1-8, 2017
download: 121
Compact Bandwidth-Enhanced Center-Fed CPW Zeroth-Order Resonant Antenna Loaded by Parasitic Element
Sobhan Saravani Chandan Kumar Chakrabarty Norashidah Md. Din
A low-profile bandwidth-enhanced zeroth-order resonant (ZOR) antenna based on composite right/left-handed transmission line (CRLH-TL) theory loaded by parasitic element is presented in this paper. The bandwidth and efficiency of the proposed ZOR antenna is improved simultaneously by introducing a parasitic element resonating within the CRLH-TL band-stop. The dispersive behavior of the ZOR antenna is analyzed by performing full-wave simulation using CST microwave studio and compared with the theoretical circuit model. The overall dimensions of the proposed antenna is 0.303λ0×0.248λ0×0.003λ0. The antenna has been fabricated and tested. The experimental results exhibit widem operational bandwidth of 87.1% and excellent radiation efficiency up to 95.7%. Owing to the symmetrical configuration of the proposed design the polarization purity better than -14 dB is obtained. The measured results are in very good agreement with the simulation. The compact, uni-planar and via-less configuration of the proposed antenna with reasonable polarization purity makes it desirable to be used for modern wireless communication systems such as GSM, UMTS, WiMAX, WLAN and LTE.
COMPACT BANDWIDTH-ENHANCED CENTER-FED CPW ZEROTH-ORDER RESONANT ANTENNA LOADED BY PARASITIC ELEMENT